Process of extracting paraffine from oils by filter-press



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l R. H. SMITH. PROGESS 0F EXTRAOTING. PARAFFINB PROM OILS BY FILTER PRESS. No. 306,653. Patented ont. 14, 1884.

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PROCESS 0F ExTRAcTlNerABlA-'FFLNE FROM olLsBY FILTER-PRESS.

s PECIFICA'i-Iorr forming pare of Letters iraient No. 306,653, dated october 14, 1884.'

` Application tiled March 2l, 1`8i84. `(N'o model.) Y l l v T0, aZZ whom it may concern.-

Beit,known that LROLLIN H. SMITH, a

citizen ofthe United; States, residing at Carbondale, in the county of, Lackawanna, State .of Pennsylvania, have invented a Process of Extracting Parafne from Oils by Filter- Press, and in improvementsrelating thereto, of which the following is a specification.

Heretofore filter-presses have been composed of a series of cast-iron orwooden plates, constructed with the outer rim of the plates considerably thicker thanthe web, so that when arranged in the press, with suitable textile material introduced between the plates to act as a strainer, the rims press tightly together, forming within the plates chambers or recesses for the reception of the paraiiine or other solid materials.

My limprovement consists in making the plate of wrought-iron or other materialthat will bend rather than break under-pressure, and attaching to it a flexible rim or ange, and also 'a number of pads of the same material,

between the flange and the central hole of the` plate, the purpose of using these pads being to form a series of intermediate supports, and thus materially strengthen the plates.

The advantages of using textile fabrics or other flexible materials for constructing the liange and central supporting-pads are that they form the necessary thickness for separating the plates without increasing the rigidity of the plates or adding materially to their weight. These flexible flanges also allow of the plates tting closely together, forming a tight joint when in the press, without the expense or trouble incident to the finishing of cast-iron plates. The plates, for convenience of construction, are made round, and are built up of three thicknesses of Wrought-iron riveted together. The central hole is perforated through all three thicknesses of the plate. W'ith the exception of this central hole and those necessary for the rivets holding on the flanges and other parts, the central plate is solid, and is extended on each side into cars to attach the complete plate to the machine. The outer plates are perforated with a large number of small holes, the bottoms of which abut against the central plate. rlhe flexible rim is preferably made up of one or more thicknesses of canvas, ordinary cotton-duck more than one'thickness of canvas is used,'an'd answering-for this purpose, though any .suitl able iie'xiblefmateriall may4 vbe used. When it is preferable i to use several thicknesses,

these several layers are stitched together.,;r'iv Y eting being objectionable, because interfering with the compressibility of the rim.n It isbest to use three or morethicknesses of canvas, the top andbottom layers being extendedfarther toward the center ofthe.' plate to forni a flange j I below the level of the, rest .of itherimforthe rivets which secure the rim tothe bodyofthe plate. These rivets pass ythrough both plates, and should have washers. under their-.heads nextthe canvas. A the flexible rim tothe plate,'it may beneither placed loosely between the plates, beingheld in place merely by pressure, or it may,be,at-,l tached to the cloths which are placed between the plates. n thickness as the outer rim, and of the same'lor similar rflexible material, and it isvbestthat they should be composed of the same number of layers as the outside, as it is importantthat their compressibility should be the sameasthe outer rim, that the plate may not be strained. rIhe several layers are stitched together,""a ajhlole` is pierced through the center pad, and it isgriv-f eted through the plate to the pad on theopposite side. The hole through the outer layeij'sof the pads is made larger than the rest, in order and the contact of the two-opposite .rivets be thus prevented. f These pads are made, preferably,with tapering sides, are smaller at the top,

and are placed so as to come opposite one another. To form an even bearing-surface, at least three pads should be used; but more can be used, and in very large plates it might be found desirable to use two or more rowsl of them. In the drawings six pads are shown. These pads may also be used in the old style of plate, and the form of my plate may be varied;- but I have found the circula-r form mostfconvenient. Vhen these pads are used, as they may be, with the old style of plate, it is best. to make them of metal or wood.

In the drawings, Figure l is a side View of the plate, and Fig. 2 is a central cross-Sectio of the plate.

A' A are the outer plates, of wrought-iron,l forming with the outer plate, A', the web. B

Vhile Iniuch prefer to rivet The central pads arev of thefs'ame f IOO is the center hole, passing entirely through the plate. b b, &c., are the sniall holes in the plates A A. C C are the pads, of fiexible inaterial, having rivets c, for securing` theni to the plate. D D are the ears for securing the plate in the press. Eis the flexible rim, secured to the web of the plate preferably by the rivets f f.

My improved plates are introduced and used in a filter-press frame in the usual Well-known manner.

Vhat I claim as niy invention, and desire to secure by Letters Patent, is

l. Extracting paraffine or.solid substances from oils or other liquids by a series of filterplates so arranged in a fraine that the flexible rims of such plates, coming together, form a tight joint andan inner receptacle between the web of the plates for the deposit of the solid substances.

2. A filter-press plate constructed of three or more plates ofwroughtiron j oined together, the center plate being solid and the outer plate pierced by numerous small holes or openings, substantially as described.

3. A filter-press plate composed of three or more Wrought-iron plates and an outer flexible riln, substantially as and for the purpose described.

4. The combination of a filter-press plate with a flexible outer rim, substantially as dcscribed. v

5. A filter press plate composed of a Wrought-iron plate, a flexible outer rim, and a flexible supporting-pad arranged within the rim, substantially as described.

G. The combination of' a filter-press plate with a flexible outer rim and flexible inner supporting pads or blocks, substantially as and for the purpose described.

7. A filter-press composed of a series of filter-plates constructed of Wrought-iron plates, an outer flexible rim, and inner flexible pads arranged in the press so that the flexible rims come together, forming a tight joint and an inner receptacle for the deposit of the solid substances, substantially as and for the purpose described.

In witness whereof l have hereunto set my hand.

ROLLTN H. SMITH.

litnessesz Crus. O. illELLnN, W. A. MANvILLn. 

